The Header and all the features under it are customised from the Venue Editor. Currently, the header settings and features are customised at a livepage level (i.e. the settings for each header is different on each livepage) but having header settings at the venue level is work-in-progress.
Turning on/off the Header
The whole header can be turned on or off on a particular livepage by clicking on the header's switch icon.
Turning on/off a Particular Feature
Each particular feature under the Header can be turned on/off by clicking on the switch icon of that particular feature.
This allows you to customise the look and feel of the header by inserting custom CSS. To learn more about how to customise the CSS, read the documentation: